Who is Captain Deadbolt Vulpoon from The Last of the Sky Pirates and what is their importance?

Captain Deadbolt Vulpoon is a sky pirate captain. He was captured by shrykes and imprisoned to lure his crew. Vulpoon is caged at a rest platform along the Great Mire Road, and Rook befriends him. Rook also helps him escape during the sky-pirate raid.